An interesting distinction from The Still Man:
A Crypto-Catholic is a Roman Catholic who hides his Catholic identity from those non-Catholics with whom he lives, works, and associates in order that wherever he is, he may always work in the interests of the Catholic Church unsuspected by his family, friends, and associates. Roman Catholic doctrine permits and even encourages Catholics to be Crypto-Catholics. Former Roman Catholic priest, Charles Chiniquy wrote, “The theologians of Rome have assured us that we may, and even that we must, conceal our faith” (Fifty Years in the Church of Rome, p. 77).
A Christolic is a person who has been raised or greatly influenced by a Crypto-Catholic, masquerading as a Christian, to the extent that his theology is essentially Roman Catholic, even though he has never been baptized into the Roman Catholic Church, or received formal instruction in Roman Catholic doctrine. Examples would be the children of a Crypto-Catholic parent or grandparent, or the congregation of a Crypto-Catholic pastor, masquerading as a Protestant.